Morphology, mechanical property, and processing thermal stability of PVC/La‐OMMTs nanocomposites prepared via<i>in situ</i>intercalative polymerization

Wang, Heyun; Li, Yingchun; Wei, Zhong; Song, Yanmei; Liu, Qiang; Wu, Chunlin; Wang, Hao; Jiang, Haoji

doi:10.1002/vnl.21719

Cited by 12 publications

(13 citation statements)

References 36 publications

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“…It is found that the final achieved average grain size is influenced by the type and the concentration of particles. 2,24,44 It can be observed that, Sauter mean diameter of the final PVC grains shows an upward trend versus the percentage of dispersed particles. This is explicable by the fact that the pre-dispersion of the particles into the monomer causes an increase in the viscosity of the organic phase, thereby facilitating the coalescence and preventing the breakup.…”

Section: Polymers and Polymer Composites 29(9s)mentioning

confidence: 96%

“…However, its low heatsoftening temperature and poor toughness and limit its application as a kind of engineering plastics. [1][2][3][4][5] In recent years, the use of inorganic particles dispersed in a PVC matrix to provide high-performance novel materials has attracted intense interest lately from academic and industrial researchers. 6 Among nanofillers, the layered double hydroxides (LDHs) are one of the most specific inorganic fillers that have been used extensively in polymer nanocomposite preparation.…”

Section: Introductionmentioning

confidence: 99%

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In situ suspension polymerization of vinyl chloride/3-(trimethoxysilyl) propyl methacrylate (MPTMS)-intercalated Mg-Al-hydroxide layered double hydroxide: I. Grain properties

Darvishi

Bijhanmanesh

Payam

2021

Polymers and Polymer Composites

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Suspension polymerization of vinyl chloride (VCM) was carried out in the presence of particle of both pristine Mg-Al layered double hydroxide (LDH) and LDH intercalated by 3-(trimethoxysilyl) propyl methacrylate (MPTMS-LDH) in a pilot-scale reactor. The experiments were conducted at different concentrations of each type of the particles (0, 1, 3, 5, 7 wt. % of VCM). The pure LDH and MPTMS-intercalated LDHs were used as co-monomer for fabrication of LDH or MPTMS-LDH/PVC nanocomposites; the particles were directly pre-dispersed in monomer phase before dispersing in the continuous aqueous phase and starting the suspension polymerization. The basal spacing obtained from the X-ray powder diffraction (XRD) showed that the reaction between VCM and MPTMS-LDH was effective, with a further intercalation of PVC chains in the interlayer space. The molecular characterization showed that the polydispersity index (PDI) and molecular weight of the poly (vinyl chloride) (PVC) resin do not change in the presence of the pristine LDH. The MPTMS-LDH, however, decrease the molecular weight and increase the PDI of PVC resin. Also, from the morphological point of view, scanning electron microscopy (SEM) showed that PVC grains produced with high particles content had a smoother surface with more regular shape. Moreover the incorporation of nanoparticles in the VCM suspension polymerization, made particles with a narrower size distribution. The LDH results in the formation of smaller primary particles with higher internal porosity whereas, the larger primary particles with lower internal porosity in the presence of modified particles was observed.

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Section: Polymers and Polymer Composites 29(9s)mentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

In situ suspension polymerization of vinyl chloride/3-(trimethoxysilyl) propyl methacrylate (MPTMS)-intercalated Mg-Al-hydroxide layered double hydroxide: I. Grain properties

Darvishi

Bijhanmanesh

Payam

2021

Polymers and Polymer Composites

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“…As we known, different morphologies and sheet sizes of LDHs could significantly affect the thermal stability, smoke-suppression, and mechanical properties of PVC nanocomposites [29,30]. Based on this contribution, the thermal degradation behavior of PVC-LaLDHs nanocomposites was investigated using TGA, as shown in Figure 3 and Table 1.…”

Section: Thermal Stability Performance Of Pvc-laldhs Nanocompositesmentioning

confidence: 99%

“…Thus, the PVC-LaLDHs2 exhibits satisfying strength and toughness. It is supposed that appropriate amount of La ions in composites can catalyze and generate complex with PVC [22,29,32], which increase tensile strength and elastic modulus with little affecting elongation at break of PVC. As La 3+ / Al 3+ molar ratio increases to 1 / 5, PVC-LaLDHs4 still shows obvious ductile fractured characteristics but agglomeration within the PVC matrix, implying that the dispersion between LaLDHs4 particles and PVC is poorer than that of LaLDHs2 in PVC.…”

Section: Morphological Studies Of Pvc-laldhs Nanocompositesmentioning

confidence: 99%

Efficient Thermo-Stability and Smoke-Suppression Properties of La Doping Mg-Al LDHs on PVC Nanocomposites

Zhang¹,

Xu²,

Wang³

et al. 2021

Mater. Plast.

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Despite the advantages of the non-flammable, good performance and low price, poly (vinyl chloride) (PVC) still suffer from poor thermal stability, restricting its melting process and applications. Although addition of some heat stabilizers can be used to improve the low thermal stability, so far, they normally compromise the environmental issues and smoke density of PVC during combustion. In this work, a series of La doping Mg-Al layered double hydroxides (LaLDHs) with different molar ratio of La3+ / Al3+ were successfully synthesized by coprecipitation-hydrothermal method and characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR), Scanning Electron Microscopy (SEM) and Transmission electron microscopy (TEM). The results showed that the as-prepared LaLDHs exhibit plate-like morphology with a lateral size around 100-180 nm. The different as-prepared LaLDHs were introduced into PVC as heat stabilizer to prepare PVC nanocomposites. The thermal stability and smoke suppression of PVC nanocomposites were investigated by TGA, thermal aging, Congo red and smoke density rating test (SDR), respectively. All the results demonstrated that PVC-LaLDHs2 nanocomposites containing 2% LaLDHs2 (the molar ratio of La3+ / Al3+ is 1 / 3) were optimized, which achieved the maximal T50% value of 337.2 oC, minimal SDR value of 45.6%, and prolonged the thermal aging time from less than 10mins to 90mins, respectively thermal stability time from 1242s to 2751s. In addition, the tensile strength and elastic modulus of PVC-LaLDHs2 respectively increased by 84.4% (56.6 MPa) and 75.5% (1019.4 MPa) with little affecting elongation at break of PVC. LDHs (layered double hydroxides); rare earth ions; thermal stability; smoke suppression; poly (vinyl chloride)

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“…Wang, et al, 2001 made successful trial to prepare and characterize PVC/ modified montmorillonite nanocomposites using melt compounding method. Many researches have followed that to improve the resulting properties of PVC/ montmorillonite nanocomposites using melting compound method (Matuana, 2009), in situ polymerization method (Wang, et al, 2019) and solution blending method (Wang & Wilkie, 2002;Arunvisut, et al, 2007;Madaleno, et al, 2010) have studied the effect of nanosized organoclay as a filler in plastics industries. Motawie, et al, 2014 have studied the effect of nano-size organo clay on the physical and chemical properties of PVC compound.…”

Section: Introductionmentioning

confidence: 99%

Influence of Low-Grade Bentonite Modification on Mechanical, Thermal and Electrical Properties of PVC/Clay Nanocomposites for Electrical Applications

Ragab

El‐Shafeiy

Abdel-Motelib

et al. 2021

Egyptian Journal of Geology

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T HE main aim of this research is to investigate the suitability of using a low-grade bentonite in poly vinyl chloride (PVC)/clay nanocomposites for electrical applications. Bentonite was modified using Benzalkonium Chloride (BAC) as cationic surfactant, then both raw and modified bentonite (RB and MB) were introduced as fillers in mixture with PVC resin, plasticizer and stabilizer to produce PVC insulation compound for cables manufacturing. X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis were carried out to investigate the mineralogical and chemical composition of bentonite sample. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and contact angle (CA) tests were performed on PVC insulation compound to investigate the interaction and compatibility between bentonite and PVC. Further investigations were established to characterize mechanical, thermal, and electrical properties of PVC compounds. The bentonite sample results show that bentonite is of low-grade bentonite. PVC/ clay insulation compounds results show that compatibility between PVC and bentonite increases in case of using modified bentonite (MB), therefore, the hydrophobicity of resulted PVC compound increased. Moreover, PVC/ MB nanocomposites show better mechanical properties (such as tensile strength and elongation at break) than PVC/ raw bentonite (RB) nanocomposites;the tensile strength values have increased from 21.1, 20, 19.1, and 18.2 N/mm2 for 2.5, 5, 7.5, and 10 phr of RB, respectively, for PVC/RB nanocomposite samples to 22.4, 21.3, 20.5, and 20 N/mm2 for the corresponding PVC/MB nanocomposites, On contrast, PVC/ RB nanocomposites give significantly better thermal properties (thermal stability) and electrical properties; the volume resistivity were decreased from 1.071012 for PVC/RB nanocomposites 10 phr of RB for to 5.86×1010 Ω•cm for the corresponding PVC/MB nanocomposite.

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Morphology, mechanical property, and processing thermal stability of PVC/La‐OMMTs nanocomposites prepared viain situintercalative polymerization

Cited by 12 publications

References 36 publications

In situ suspension polymerization of vinyl chloride/3-(trimethoxysilyl) propyl methacrylate (MPTMS)-intercalated Mg-Al-hydroxide layered double hydroxide: I. Grain properties

In situ suspension polymerization of vinyl chloride/3-(trimethoxysilyl) propyl methacrylate (MPTMS)-intercalated Mg-Al-hydroxide layered double hydroxide: I. Grain properties

Efficient Thermo-Stability and Smoke-Suppression Properties of La Doping Mg-Al LDHs on PVC Nanocomposites

Influence of Low-Grade Bentonite Modification on Mechanical, Thermal and Electrical Properties of PVC/Clay Nanocomposites for Electrical Applications

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